Some few are rated at less - maybe 500 mAh and a few at higher. Modern USB phone chargers which have a USB plug as their output and which plug into a device's USB port are chargers in their own right. A charger capable of charging a phone at 5V, 2A will almost certainly also charge a tablet OK at 5V, 2A.
The more months payed for upfront, the cheaper the cost per month. E-liquid subscriptions range in price form $29.99 paid monthly, $86.97 paid every three months or $167.94 paid every six months. All three plans include shipping in the price.
Just for fun, this says that if I purchased a zero-pack of batteries (you know, just the packaging or something) it would cost $2 for the Duracell and $5 for the Energizer. The slope tells you how much one battery would cost (without the packaging â I guess you would have to bring your own box to the store).